Adaptive network modeling scheme

As the network based economy has entered new dimension, there is more need than ever for network performance modeling and optimization. These things will help the proper routing and protection of data elements traversing the networks. Currently, network service providers (NSPs) use TCP/IP (Transmission Control Protocol/Internet Protocol) extensively. The NSPs focus the delivery of hybrid services and features such as voice over IP (VOIP), and virtual private networks (VPNs), over single or multiple IP connections. For network-based applications to be efficient and effective, they must have adequate quality of service (QoS) support and guarantees. User level QoS violations are events, which can be described using traditional rare-event reliability and availability network models. Network parameters such as: the performance matrices, end to end congestion, network delay, average download response times, throughput blocking probabilities, and packet loss rates, should be modeled successfully to implement QoS. The authors have developed an operating model for a practical wide area network using industry standard tools such as OPNET Modeler. In addition, the network modeling schemes available from the UNIX and windows platforms have been analyzed and the corresponding results are compared for the modeling accuracy and integration. The authors present the parameters for the dynamic service delivery on a unified network core using network modeling schemes. In addition, one of the scenarios dealing with network performance and QoS using OPNET simulation tools are presented.